Writing instrument



FIG. 1 is an isometric view of a writing instrument showing our new design;

FIG. 2 is a front view of FIG. 1, the back view, left side view, and right side view each being identical to FIG. 2;

FIG. 3 is a top view of FIG. 1; and,

FIG. 4 is an enlarged bottom view of FIG. 1.

The broken lines in the drawings of FIGS. 1-4 are included for the purpose of showing portions that form no part of the claimed design. 

CLAIM We claim the ornamental design for a writing instrument, as shown and described. 